Effect of temperature on crack initiation in gas formed structures

详细信息    查看全文

• 作者：S. Gohari (1)
  S. Sharifi (2)
  G. Sharifishourabi (2)
  Z. Vrcelj (1)
  R. Abadi (3)
  
• 关键词：Crack initiation ; Gas ; forming process ; Damage mechanics ; Ductile damage ; Finite element simulation ; Experimental approach
• 刊名：Journal of Mechanical Science and Technology
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：27
• 期：12
• 页码：3745-3754
• 全文大小：1,728 KB
• 作者单位：S. Gohari (1)
  S. Sharifi (2)
  G. Sharifishourabi (2)
  Z. Vrcelj (1)
  R. Abadi (3)
  
  1. College of Engineering and Science, Victoria University, Melbourne, VIC, Australia
  2. Centre for Composites, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, UTM Skudai, Skudai, Malaysia
  3. Faculty of Civil Engineering, Universiti Teknologi Malaysia, UTM Skudai, Skudai, Malaysia
  
• ISSN：1976-3824

文摘

In the gas forming process, the work piece is formed by applying gas pressure. However, the gas pressure and the accompanying gas temperature can result in crack initiation and unstable crack growth. Thus, it is vital to determine the critical values of applied gas pressure and temperature to avoid crack and fracture failure. We studied the mechanism of fracture using an experimental approach and finite element simulations of a perfect aluminum sheet containing no inclusions and voids. The definition of crack was based on ductile damage mechanics. For inspection of initiation of crack and rupture in gas-metal forming, the ABAQUS/EXPLICIT simulation was used. In gas forming, the applied load is the pressure applied rather than the punching force. The results obtained from both the experimental approach and finite element simulations were compared. The effects of various parameters, such as temperature and gas pressure value on crack initiation, were taken into account.